an issuing forth suddenly and violently; outburst; outbreak.
Geology. the ejection of molten rock, steam, etc., as from a volcano or geyser.
something that is erupted or ejected, as molten rock, volcanic ash, or steam.
the breaking out of a rash or the like.
a rash or exanthem.

1375–1425; late Middle English < Latin ēruptiōn- (stem of ēruptiō). See erupt, -ion

eruptional, adjective
noneruption, noun
preeruption, noun
reeruption, noun

eruption, irruption. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
erupt (ɪˈrʌpt)
1.  to eject (steam, water, and volcanic material such as lava and ash) violently or (of volcanic material, etc) to be so ejected
2.  (intr) (of a skin blemish) to appear on the skin; break out
3.  (intr) (of a tooth) to emerge through the gum and become visible during the normal process of tooth development
4.  (intr) to burst forth suddenly and violently, as from restraint: to erupt in anger
[C17: from Latin ēruptus having burst forth, from ērumpere, from rumpere to burst]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1555, from L. eruptionem (nom. eruptio) "a breaking out," from stem of erumpere "break out, burst forth," from ex- "out" + rumpere "to break, rupture" (see rupture).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

eruption e·rup·tion (ĭ-rŭp'shən)

  1. An appearance of a rash or blemish on the skin.

  2. Such a rash or blemish.

  3. The emergence of a tooth through the gums.

e·rup'tive (-tĭv) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
eruption   (ĭ-rŭp'shən)  Pronunciation Key 
The release of gas, ash, molten materials, or hot water into the atmosphere or onto the Earth's surface from a volcano or other opening in the Earth's surface.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
But in retrospect, the eruption can be seen to exemplify certain truths about
  climate change.
The resort town was forced to close its airport due to the weekend eruption.
The character of an eruption is based on the prehistoric and historic record of
  the volcano in question and its volcanic products.
It started underneath a glacier nearby the first eruption.
Images for eruption
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